import axios from 'axios' // 1 、要对axios进行封装，所以先引用axios
import { MessageBox, Message } from 'element-ui'
import store from '@/store'
import { getToken } from '@/utils/auth'

// axios.defaults.headers = { 'Content-Type': 'application/json;charset=UTF-8;' }
// create an axios instance
const service = axios.create({
  baseURL: process.env.VUE_APP_BASE_API, // url = base url + request url
  // withCredentials: true, // send cookies when cross-domain requests
  timeout: 5000 // request timeout
}) // axios封装的作用之1：将接口的地址baseurl进行统一管理，便于项目在发布或是
// 环境变化时只改配置文件，而不用一个一个的。
// 他用axios.create来新创建了一个service的实例，这个实例里将baseurl进行了封装
// 可以定义请求接口的超时时间。

// request interceptor 请求拦截
service.interceptors.request.use(
  config => {
    // do something before request is sent
    /* 可以配置某些请求必要的头部参数，如请求验证 统一配置接口要传送的头部信息*/

    if (store.getters.token) {
      // let each request carry token
      // ['X-Token'] is a custom headers key
      // please modify it according to the actual situation
      config.headers['X-Token'] = getToken()
    }
    return config
  },
  error => {
    // do something with request error
    console.log(error) // for debug
    return Promise.reject(error) // 通过异步返回结果
  }
)

// response interceptor 请求响应
service.interceptors.response.use(
  /**
   * If you want to get http information such as headers or status
   * Please return  response => response
  */

  /**
   * Determine the request status by custom code
   * Here is just an example
   * You can also judge the status by HTTP Status Code
   */
  response => {
    console.log(response)
    const res = response.data
    console.log(res.code)
    // if the custom code is not 20000, it is judged as an error.
    if (res.code !== 200) { // 如果不是200，就是接口没有请求成功，，统一拦截，不用
      // 在前台一个一个的判断
      Message({
        message: res.message || 'Error',
        type: 'error',
        duration: 5 * 1000
      })

      // 50008: Illegal token; 50012: Other clients logged in; 50014: Token expired;
      if (res.code === 50008 || res.code === 50012 || res.code === 50014) {
        // to re-login
        MessageBox.confirm('You have been logged out, you can cancel to stay on this page, or log in again', 'Confirm logout', {
          confirmButtonText: 'Re-Login',
          cancelButtonText: 'Cancel',
          type: 'warning'
        }).then(() => {
          store.dispatch('user/resetToken').then(() => {
            location.reload()
          })
        })
      }
      console.log(res)
      return Promise.reject(new Error(res.msg || 'Error'))
    } else {
      return res
    }
  },
  error => {
    console.log('err' + error) // for debug
    Message({
      message: error.message,
      type: 'error',
      duration: 5 * 1000
    })
    return Promise.reject(error)
  }
)

export default service
